Punching-machine



2 Sheets-Sheet 1. D. S. SHERMAN. 5

Making Metal Nuts.

No. 20,516. Patehted June 8,1858.

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2 Sheets-Sheet 12. D. S. SHERMAN.

Making Metal Nuts. v No. 20.516. Patented June 8, 1858.

STATES 'ANT curios.

DAVID S. SHERMAN, OF LOWVELL, MASSACHUSETTS.

PUNCHING-MACI-IINE.

To all whom it may concern:

Be it known that 1, DAVID S. SHERMAN, of Lowell, in the county of Middlesex and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Machines for Punching i uts, Vashers, &c., from Bar or Plate Iron; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon.

Similar letters in each of the several figures refer to similar parts.

Figure 1 represents a plan or top view of my machine. Fig. 2, is a view of one end, part of the frame being removed to show more distinctly the shipping apparatus. Fig. 3 is a front elevation of the shipping apparatus. Figs. 4, 5 and 6 are longitudinal sections, each taken in the same vertical plane, and are intended to show the different positions assumed by the punches, &c., during the process of forming a nut.

A, A, &c., represents the frame.

13 is the driving wheel running loose on the end of the shaft C.

D is a cam secured to shaft C a-nd'is intended to operate the square punch E.

F, F, are cams also secured to shaft C, and they operate the movable carriage Gr, Gr, in which is secured the die H. The carriage Gr, G, slides forth and back on the ways I, I. The punch E is secured to the barrel J, by means of a set screw, and both slide in the carriage G, G.

K, is a stationary clearer fixed by means of the stud L to the cross bar M.

G is a stationary carriage secured to the frame A and it carries punches and dies which are similar to those in the movable carriage Gnamely, the square punch E secured to the sliding barrel J the die H, and the stationary punch K.

\Vhen shaft C is thrown into gear with the driving wheel B and made to revolve, it produces the following effects, viz: Figs. 1 and 4 represent the first position of the machine, or that in which it is ready to receive the plate to be punched. Now by a partial revolution of the shaft C, the cam D is made to push forward the square punch E until it clamps the plate P (shown in red) Figs. 5 and 6 between E and E. Then the cams F, F, push forward the movable carriage G which carries die H, and forces die H against the plate P until it has cut the plate half off or more or less. This posit-ion is shown in Fig. 5.

Fig. 6 represents the third position where the shaft C has turned a little more, and the cams F, F, have held the carriage G in its position as shown in Fig. 5, but the cam D by means of its second rise or projection, has pushed forward the square punch E, which has carried back the partially punched nut, and has pushed it entirely through the plate P and into the die H, at the same time the stationary punch K meeting the nut as it enters the die H forces a round piece from its center, and thus a perfect nut is formed.

Now as the shaft 0 completes its revolution the cams are turned out of the way so as to allow the spring (a,) to draw back the carriage G, and the machine assumes its first position Figs. 1 and 4 in doing which the stationary clearer K removes the center piece from square punch E and square punch E removes the newly formed nut from the die H and the machine is ready to punch another nut.

It is necessary to explain how the square punch E gives way as the punch comes forward from position shown 1n Fi 5.

The cams D and F, F, are so constructed as to retain the punches in this second posltion, while the movement of the shaft C brings the cam N against the lever O which by means of the connecting rod Q, rocker R, R, and link S, throws up the toggle jointed straps T, T, which connect the barrel J with the stand U on the frame A, and thus the support to the punch E being removed, the forward movement of the punch E will force E back into the die H. But there are springs Z, Z, attached to the toggle joints T, T, which press down on them suflicien-tly to hold the punch E in close contact with the advancing nut; and whether the nut be thick or thin, the punch E will still hold it with the same yielding force.

As the shaft C revolves to its first position, it brings a cam V in contact with lever W which by means of the connecting rod X and lever Y throws forward the barrel J which straightens out the toggle joint, pushes the newly formed nut from the die H, and prepares the square punch E to clamp the plate again.

The spring Z, Z, Figs. 1 and 4: assist in keeping the toggle joints straightened out.

I will now describe the apparatus for throwing on and off the motion of the driving wheel B, to the shaft C.

B is intended to be a heavy fly wheel turning loose and at a rapid rate on the end of the shaft C, and it gives motion to C only when the coupling ((Z) is thrown into gear with B. This is accomplished by means of the operator putting his foot on the treadle (6) Figs. 2 and 4t and pressing it down to the floor, which by means of the arm (f) and latch rod (g) draws on the lower end of the forked lever (72.) throwing the upper end of it out so as to bring the coupling (cl) into gear with B. The coupling (d) slides forth and back on the shaft C but is confined to it by the spline Fig. 2, so that when the coupling (cl) is revolved, the shaft C must turn with it. Now as the lever (it) throws the coupling toward the fly wheel, one of the arms of the fly wheel strikes against the projecting pin (j) in the coupling (d) and thus causes shaft C to revolve, but shaft 0 can make only one revolution at a time, because the cam projection (is) in the periphery of the coupling (d) as it completes its revolution, comes in contact with the sliding rod (Z) confined on the face of the lever (h) and pushes it down so as to throw old the latch rod (g) from the end of the lever (71.) thus liberating the lever from the latch, and the spring throws the lower end of the lever (it) into its former position, and thus throws the coupling (cl) out of gear with the fly wheel, and the shaft C is stopped instantaneously. The operator now takes his foot' from the treadle (6) when the spring (7) will throw it up again, and the latch rod (g) will be moved into its former position (shown in Fig. 2) ready to throw the coupling into gear a second time.

It will thus be seen that though the driving wheel B, has a rapid and constant motion, the shaft G is revolved only at the will of the operator. This is essential to the perfect working of the machine, and it is also as essential that but one revolution of the shaft shall be given at a time, because the operator must have time to adjust his plate or bar to be punched; and as this time is likely to vary under different circumstances, the power must not be applied until he is ready, and when he has put his foot upon the treadle, he cannot of course remove it at the exact time that one revolution of shaft 0 is made; therefore the machine is made to throw itself out of gear, as has been described.

My machine is peculiarly adapted to punching red hot plate or bar iron.

In common machines where one die and one punch is used and the nut is struck out at one blow, there is a bur or rough edge left on the side struck by the punch, which makes a defective nut; now my machine, acting as it does, to punch the nut half way out (or more or less) in one direction and then punching it out entirely in the opposite direction, remedies this defect, and makes anut with perfectly smooth edges.

I do not claim the device shown in the p ptent of R. H. Cole, dated June 3d 1856.

lVhat I do claim and desire to secure by Letters Patent, is:

The manner of punching a nut, washer or other article from plate or bars by forcing it half way out (or more or less) in one direction into a die, and then forcing it entirely out in the opposite direction into another die, for the purpose of making the outside edges of the nut perfectly square and free from a sharp or bur edge substantially as described.

In witness whereof I have hereunto set my signature this 16th day of February A.

DAVID S. SHERMAN. In presence of- WM. G. WARD, GEORGE WELLMAN. 

